package com.itic.web.util;

import java.security.MessageDigest;  
  
/** 
 * 采用MD5加密解密 
 * @author tfq 
 * @datetime 2011-10-13 
 */  
public class MD5Util {  
  
    /*** 
     * MD5加码 生成32位md5码 
     */  
    public static String string2MD5(String inStr){  
        MessageDigest md5 = null;  
        try{  
            md5 = MessageDigest.getInstance("MD5");  
        }catch (Exception e){  
            System.out.println(e.toString());  
            e.printStackTrace();  
            return "";  
        }  
        char[] charArray = inStr.toCharArray();  
        byte[] byteArray = new byte[charArray.length];  
  
        for (int i = 0; i < charArray.length; i++)  
            byteArray[i] = (byte) charArray[i];  
        byte[] md5Bytes = md5.digest(byteArray);  
        StringBuffer hexValue = new StringBuffer();  
        for (int i = 0; i < md5Bytes.length; i++){  
            int val = ((int) md5Bytes[i]) & 0xff;  
            if (val < 16)  
                hexValue.append("0");  
            hexValue.append(Integer.toHexString(val));  
        }  
        return hexValue.toString();  
  
    }  
  
    /** 
     * 加密解密算法 执行一次加密，两次解密 
     */   
    public static String convertMD5(String inStr){  
  
        char[] a = inStr.toCharArray();  
        for (int i = 0; i < a.length; i++){  
            a[i] = (char) (a[i] ^ 't');  
        }  
        String s = new String(a);  
        return s;  
  
    } 
    
	//String isoString = new String(bytes,"ISO-8859-1");
	//String srt2=new String(midbytes,"UTF-8");
	public static String bytes2string(byte[] midbytes,String charset){
		String srt2=null;
		try {
			srt2=new String(midbytes,"UTF-8");
		} catch (Exception e) {
		}
		return srt2;
	}
	
	//byte[] midbytes=isoString.getBytes("UTF8");
	//为UTF8编码
	//byte[] isoret = srt2.getBytes("ISO-8859-1");
	public static byte[] string2bytes(String srt3,String charset){
		byte[] isoret = null;
		 try {
			isoret = srt3.getBytes("UTF-8");
		 } catch (Exception e) {
		     }
		 return isoret;
	}
  
    // 测试主函数  
    public static void main(String args[]) {  
/*        String s = new String("tangfuqiang");  
        System.out.println("原始：" + s);  
    	System.out.println("MD5后：" + string2MD5(s));  
        System.out.println("加密的：" + convertMD5(s));  
        System.out.println("解密的：" + convertMD5(convertMD5(s))); */ 
    	String s = new String("15201699383-8888-20180827");
    	System.out.println("原始：" + s);  
    	System.out.println("MD5后：" + string2MD5(s));  
    	System.out.println("加密的：" + convertMD5(s));  
    	
    	//加密
    	String hex = Toolkit.bytes2Hex(string2bytes(convertMD5(s),"UTF-8"));
    	System.out.println("加密后转16进制的：" + hex);
    	//加密后把第6位进1
    	hex = HexUtil.updateHex(hex);
    	System.out.println("加密后16进制再加盐后的：" + hex);
    	
    	
    	
    	String backhex = HexUtil.backHex(hex);
    	System.out.println("解密去盐后的：" + hex);
    	//解密
    	String back = convertMD5(bytes2string(Toolkit.hex2Bytes(backhex),"UTF-8"));
    	System.out.println("解密后十进制的：" + back); 
    	
    	
    	
    	
    	
  
    }  
}
